Finding the Fourth Proportional to 1,145.98, 1,575.37 and 985.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.98 : 1,575.37 = 985.88 : x
2. Step 2: Convert to fraction form
   1,145.98/1,575.37 = 985.88/x
3. Step 3: Cross multiply
   1,145.98x = 1,575.37 × 985.88
4. Step 4: Simplify right side
   1,145.98x = 1,553,116.12
5. Step 5: Solve for x
   x = 1,553,116.12/1,145.98
6. Step 6: Final answer
   x = 1,355.28